Steam generator



NOV. 1, 1932. s. PAUL STEAM GENERATOR Filed Jan. 24, 1950 Patented Nov. 1, 1932 narra nf SAMUEL PAUL, orrirrsnuneri, rnimsifnvanrn sanar/i' eniiinneron* i '1 Application ledJan'uar-y 24, 1930. Serial No. $233,046.

My invention'relates lto steam generators, .and morel particularly tov those of the portable type. Y

One object of my invention is to provide a boiler unit 'of such forni that it may be conveniently transported, as by a hand truck or the like, and which nevertheless has considerable steam, generating capacity.

Anotherobject of my invention is to providea steam generator of such form that steam at considerable pressures can'be vproduced more quickly than inthe .case of generators of various other types.

' Another object of my invention is toprovidea steam generatorhaving aboiler shell with improved meansfcooperating therewith Ato support heating coils and the boiler proper. f f A further object Vof myinvention :is to provide a steam generator with 'an improved burner and heating coil arrangement.

l lStill'another object o fmy invention is to simplify and improve generally the structure and operation ofsteam generators,

One forni. whichby .my invention may take is 'shown `in the. .accompanying drawing, wherein Figure 1 is aI side elevational View of the apparatus; Fig. 2 is a vertioalsectional view taken at right angles to Fig. 1, and Fig. 3 is a sectional View, on an enlarged scale, of a portion of the apparatus of Fig. 2.

lVhile the apparatus is herein shown and described as employed for the generation of steam, it will be understood it may also employed as a water heater.

The apparatus is particularly suitable'for use where a light weight portable steam generating unit is desired, as around garages, to secure steam underpressure, for cleaning and flushing gear cases, etc., of automobiles. To this end, I show the apparatus as mounted upo-n a two-wheeled hand truck 4l. A fuel tank 5, for gasoline or other suitable fuel is shown as secured to the truck frame by a strap 6, while a boiler shell 7 is secured to the truck frame by a strap 8. A burner 9 is provided within the boiler shell 7 is supplied with fuel Vfrom the tank l5, through the conduits, 10, 11 and 12.

The conduit 10 has an extension 13 that Vborhood of twenty pounds.

Vmembers 27 and 28 serve to firmly s the boiler and the coils inl the l.sliell."/'. ,n

vserves to supply aipilot flamed-at pilot flame not lonly serves to ignitetheffuel issuing from. the burnerbut heats the conduit 11 so that wheny fuel isfpermitted to" issue froin the -b-urnerg9 by opening a valve e', itwill bejvaporized to' such anextent as to readily be ignited. by the Vpilot flame.

. rrlhe fuel is. supplied under air pressure' that is maintained within the tank 5, 'the air under pressure being introduced into Athe i any suitable manner as for instance r gli a tire valve 15. An airfpressure ga' e 1G is Aprovided on the tank. Pressure Y within tlie'tank may, suitably be inthe neighboiler 1'? is inourtefl within. the shell Z and a supply ofwater is maintained therein,

the water levelv being at some ,point within a gage glass v18 so thata space 'willbe ,left within the upper portion of the boiler -17 yfor steam. e V U Y rlhe boiler 17 may be initially nearlyfilled with water and lreplenishment of the water supply will not be required for aconsiderable period, thus avoiding the necessity of having permanent hose connection to the boiler.

Two coils 19 and 2O surround the boiler.

YThe coil 19 has its turns interspersed with the turns of the coil 20. rllie lower end of the 'municates with the interior. of the boiler at this point'. The upper endl ofthe coil 19 coiiirunicates with the'boilei through 'an eX- tc sion 22, in a manner .similar to its con-Y nection at the lowerend of the boiler.

rlfhe coil 20 communicates at its upper and lowereiids with the interior of the boiler,

through vextensions 23 fand 24, respectively, fg

and these branch-like extensions 23 and 24 of .theb'oiler communicate throughnipples 25 and26, respectively, withthe gage 18. The nipple members 25 and 26 and burner flame impingesagainstthe bottoni of the boiler 7 andthe heat therefrom passes up alongside ofthe boiler, in contact with the coils 1 9 and 20. l

l po

through a nipple 30, to a pipe 31.

A heat-insulating lining is provided for the boiler shell 7 to prevent radiation of heat through the shell. The water, whenV sub- `ected to heat, of course circulates upwardly through thel coils 19 and 20 and is rapidly heated by reason of the large amount of coil surface. The double coil arrangement not only serves as a convenient means for connecting the coils and the boiler to the water intake and tothe gage, but also facilitates circulationof the water, yso that the turns of each coil are of twice the pitch that would be possible with a single coil having turns equal in number to thesum of the turns of the two coils. I therefore disclose a structure wherein a large number of coil turns are provided within a given space, and wherein the pitch or steepness of the turns is'such that more rapid 'circulation of the water is possible than if the coil turns were of smaller pitch.

The steam which is formed by the water passing through the heated coils accumulates in the boiler 17 and is conducted therefrom A steampressure gage 32 has connection with the nipple 30, and a poppet or safety valve 33 has communication through `a conduit 84 with the pipe 31. A hose 35 is connected to 'the conduit 34, and through this hose steam is supplied for various purposes Such as cleaning and flushing gear cases and other parts of automobiles, etc., as above indicated. When it is desired to introduce water into Vthe boiler 17, steam under pressure is directed from the pipe 31, through a pipe 36 to Yan injector 37,*that may be of any well-known form and to which water is supplied through a supply pipe 38 that may be temporarily connected to a suitable source of supply (not shown). From the injector 37 the water flows to the boiler through the connection 21 and the nipple 28.

Further, with respect to the burner and the fuel supply therefor, the flow through the conduit 13 to the pilot tip may be controlled by a valve 39. This valve may or may not be closed during the time that the valve 14 is opened and fuel is being consumed at the burner 9. If the valve 39 is left open, and the fuel blast emitting from the burner 9 blows lout the pilot llame, the pilot will be re-ignited from the burner 9 upon closing of the valve 14 to out off the main supply of fuel. While the pilottip 14 is shown extending horizontally, it will be obvious that it can be disposed vertically, if desired.

An important feature of my invention resides in the provision of means such as the `burner tip 14 for maintaining a pilot flame as above explained. 1t is diliicult and perhaps impossible to maintain a pilot flame in connection with liquid fuel as heretofore supplied under pressure, with the fuel for the pilot supplied directly from the source of main fuel supply, and l have overcome this ieee-,371i

thereof, and each having connection with the lower end of one coil, an inlet nipple extending through the wall of the casing and connected to one of said extensions, a nipple extending through said wall and connected to the other extension, and a water gage connected to the last-named nipple and to the upper portion of the boiler, the said nipples serving to support the boiler within the casing.

2. A steam generator comprising a boiler casing, a boiler within the casing, apertured extensions on the boiler at diametrically opposite points adjacent to the bottom thereof and at opposite points adjacent to the top thereof, nipple-like members extending through the wall of the casing and connected 

